My cousin uses a power drill battery as a portable phone charger : r/mildlyinteresting
Battery Charger For Hilti, Portable C 4/12-50 12V Lithium Power Tools Battery Charger, 57W Fast Charging With Dual LED Systems & USB Port Cordless Battery Pack Charger For Hilti 12 Volt Li-ion
Ridgid R86091 18 Volt NiCd or Lithium Ion Dual Chemistry Cordless Tool Battery Charger (Bulk Packaged) : Amazon.ca: Tools & Home Improvement
RYOBI 18V ONE+ Lithium-Ion Cordless 1/2 -inch Drill/Driver Kit with (1) 1.5 Ah Battery and... | The Home Depot Canada
Best Battery Charger for Power Tools - Pro Tool Reviews